You can set video aspect, frame rate, quality, size, audio quality, sample rate, channels, volume, or leave the preset profiles and choose a quality for the output (according to the size/look you want for your video).

The program has a very simple user interface, no preview screens, no editing tools, it can't join, split, or take snapshots of videos, it is also limited to processing one file at a time, so I don't recommend it to those who want a complete video tool. It could work as a temporary solution for people who want to convert just a couple of FLV videos and don't want to pay for an expensive commercial product. This is freeware, so you can download and test at no cost.